xxn BOGDAN SERAI 283 piety which adorned its inner life/1 Owing to the proximity of the house to the landward walls3 it was one of the first shrines2 to become the spoil of the Turks on the 29th of May' 1453, and was soon used as a quarry to furnish materials for new buildings after the conquest. Gyllius visited the ruins5 and mistaking the fabric for the church of S. John the Baptist at the Hebdomon, gave rise to the serious error of placing that suburb in this part of the city instead of at Makrikeui beside the Sea of Marmora.3 Gerlach4 describes the church as closed because near a mosque. Portions, however^ of the monastic buildings and of the strong wall around them still survived, and eikons of celebrated saints still decorated the porch* On an eikon of Christ the title of the monastery, Petras was inscribed. Some of the old cells were then occupied by nuns, who were maintained by the charitable gifts of wealthy members of the Greek community, Architectural Features The building is in two stories3 and may be described as a chapel over a crypt. It points north-east^ a peculiar orientation probably due to the adaptation of the chapel to the position of the residence with which it was associated- The masonry is very fine and regular, built in courses of squared stone alternating with four courses of brick3 all laid in thick mortar joints^ and pierced with numerous putlog holes running through the walls. It presents a striking likeness to the masonry in the fortifications of the city. The lower story is an oblong hall covered with a barrel vault? and terminates in an arch and apse. In the west side of one of the jambs of the arch is a small niche. The vault for one-third of its height is formed by three courses of stone laid horizontally and cut to the circle ; above this it is of brick with radiating joints. Here cows are kept. The upper story is m. 3.75 above the present level 1 Miklosich et M tiller, i. ii. pp. 21-23. 2 Ducas, p, 288. 3 De top. C.P. iv. c. 4. 4 Tagebuc/t, p. 455.